Here is a Bulova Ordnance Department watch dating 1944. The OF on the serial number dictates that it is a 15 to 17 jewel wrist watch (waterproof case) this case back matches the description of the case and movement. Often you see the wrong caseback serial code to movement but this one is fine. There is slight discolouration neat 1 & 2 on the dial bur everything else is crisp. The hands have been relumed . The case is in mint condition with gasket and anti magnetic cover. I can't say if case has been replated but is mint. I change the nato style strap for a mint 1940s pig skin quick release band made by Streamline.